var myimages;

function preloadimages() {
    for (i = 0; i < preloadimages.arguments.length; i++){
        myimages[i] = new Image()
        myimages[i].src = preloadimages.arguments[i]
    }
}

function sp_swap(tabname, iHowMany) {
	if (iHowMany > 0) {
		for (i = 0; i < iHowMany; ++i) {
			document.getElementById('sp' + i).style.display = 'none';
		}
		
		document.getElementById(tabname).style.display = 'block';
	}
}

function sp_swap2(tabname, iHowMany) {
	sp_swap(tabname, iHowMany);
	sp_autodiv(0); 
}

function changeDiv(iHowMany) {
	if (autoDiv == 1) {
		activeDiv = (activeDiv + 1) % iHowMany;
		sp_swap('sp'+ activeDiv, iHowMany);
	}
}

function sp_autodiv(i) {
	autoDiv = i;
}

preloadimages (
	'/images/carousel-frame1.jpg',
	'/images/carousel-frame2.jpg',
	'/images/carousel-frame3.jpg',
	'/images/carousel-frame4.jpg'
);